redirect.js

$(function(){	
    var getBrowserLanguages = function(callback) {
        $.ajax({
            url: "http://ajaxhttpheaders.appspot.com",
            dataType: 'jsonp',
            success: function(headers) {
                var browserLanguages = [];
                acceptLanguage = headers['Accept-Language'];
                var splittedLanguages = acceptLanguage.split(",");
                for(var i=0; i<splittedLanguages.length; i++){
                    var language = splittedLanguages[i].split(";")[0];
                    browserLanguages.push(language);
                }
                callback(browserLanguages);
            }
        });
    };
 
    getBrowserLanguages(function(browserLanguages) {
        var url = "";
        for(var i = 0; i<browserLanguages.length; i++) {
            var browserLanguage = browserLanguages[i];
            console.log(browserLanguage);
            if(browserLanguage == "zh" || browserLanguage == "zh-TW" || browserLanguage == "zh-CN") {
                url = "http://www.heisei-web.com/chinese/";
                break;
            }
            else if(browserLanguage == "en" || browserLanguage == "en-US"){
                url = "http://www.heisei-web.com/english/";
                break;
            }
            else if(browserLanguage == "ja"){
                url = "http://www.heisei-web.com/japanese/";
                break;
            }
        }
        console.log(url);
        if(location.href.indexOf("/english/")==-1 && location.href.indexOf("/japanese/")==-1 && location.href.indexOf("/chinese/")==-1 && url==""){
            location.replace(url);  
        }
    });
});